Dynamic Range:The ratio of the amplitude of the loudest possible undistorted sine wave to the noise amplitude. 110dB is the default value and is recommended.

Output Impedance:Mainly come from the output resistor right after the op-amp output. It provides protection that the output of the amplifier sees screened cables or other capacitances. 10Ohms is the default value and is recommended.

Headphone Impedance:The AC resistance of the coil of headphones in ohms.

Headphone Sensitivity:It represents the acoustical level that the headphone transducer can produces under 1 mini-watt or 1 volt.(make sure the unit is the same as mentioned on the spec sheet)

Result:

Min Voltage Output:Vrms

Min Power Output:mWrms

Glossary:

Min Voltage Output:The Min Voltage Output is needed to drive the headphones reaching the targeted Dynamic Range.
Less than 2Vrms: The headphones are good for portable use. Extra amplification is an optional.
More than 2Vrms: A headphone amplifier is required to drive the headphones.

Min Power Output:The Min Power Output is needed to drive the headphones reaching the targeted Dynamic Range.
Less than 10mWrms: The headphones are good for portable use. Extra amplification is an optional.
More than 10mWrms: A headphone amplifier is required to drive the headphones.

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